LG C3400 User manual

Service Manual Model : C3400
Service Manual
C3400
P/N : MMBD0046201 Date : March, 2005 / Issue 1.0

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1. INTRODUCTION ................................ 2
1.1 Purpose ............................................... 2
1.2 Regulatory Information ........................ 2
1.3 Abbreviations ....................................... 4
2. PERFORMANCE ................................. 6
2.1 H/W Features ...................................... 6
2.2 Technical Specification ........................ 7
3. TECHNICAL BRIEF ......................... 11
3.1 Transceiver (SI4205-BM, U502) ....... 11
3.2 Power Amplifier Module
(SKY77325, U501) ............................ 16
3.3 26 MHz Clock (VCTCXO, X500) ....... 17
3.4 Power Supplies for RF Circuits
(RF LDO, U503) ................................. 17
3.5 Digital Main Processor
(AD6527B, U101)............................... 18
3.6 Analog Main & Power Management
Processor (AD6535, U102) ................ 24
3.7 Memory (RD38F3350LLZDQ0, U302)
.. 34
3.8 Display and Interface.......................... 35
3.9 Camera Interface................................ 37
3.10 Keypad Switches and Scanning....... 39
3.11 Microphone ...................................... 40
3.12 Main Speaker ................................... 40
3.13 Headset Interface............................. 41
3.14 MP3/AAC Decoder(uPD9993, U702) &
Amplifier(LM4923, U703) ................. 42
3.15 Key Back-light Illumination ............... 44
3.16 LCD Back-light Illumination .............. 45
3.17 VIBRATOR....................................... 46
4. TROUBLE SHOOTING ................... 47
4.1 RX Trouble ........................................ 47
4.2 TX Trouble.......................................... 55
4.3 Power On Trouble .............................. 63
4.4 Charging Trouble................................ 65
4.5 Vibrator Trouble.................................. 67
4.6 LCD Trouble....................................... 69
4.7 Camera Trouble ................................. 71
4.8 Speaker Trouble ................................ 73
4.9 SIM Card Interface Trouble................ 75
4.10 Earphone Trouble ............................ 77
4.11 KEY backlight Trouble...................... 79
4.12 Receiver Trouble ............................. 81
4.13 Microphone Trouble ......................... 83
4.14 RTC Trouble..................................... 85
4.15 Indication LED Trouble..................... 86
4.16 Folder on/off Trouble........................ 87
5. DISASSEMBLY INSTRUCTION ... 88
5.1 Disassembly ...................................... 88
5.2 Calibration .......................................... 95
6. BLOCK DIAGRAM
.......................... 98
7. CIRCUIT DIAGRAM ......................... 99
8. PCB LAYOUT ................................... 106
9. ENGINEERING MODE................... 109
9.1 BB Test [MENU 1] ........................... 110
9.2 RF Test [MENU 2]............................ 111
9.3 MF mode [MENU 3].......................... 111
9.4 Trace option [MENU 4]..................... 112
9.5 Call timer [MENU 5] ......................... 112
9.6 Fact. Reset [MENU 6] ...................... 112
9.7 S/W version [MENU 7] ..................... 112
10. STAND ALONE TEST.................. 113
10.1 Introduction .................................... 113
10.2 Setting Method .............................. 113
10.3 Means of Test ................................ 114
11. AUTO CALIBRATION .................. 116
11.1 Overview ....................................... 118
112 Requirements ................................. 116
11.3 Menu and Settings ......................... 116
11.4 AGC ............................................... 118
11.5 APC ............................................... 118
11.6 ADC ............................................... 118
11.7 Setting ........................................... 118
11.8 How to do calibration ..................... 118
12. EXPLODED VIEW &
REPLACEMENT PART LIST .... 119
12.1 Exploded View ............................... 119
12.2 Replacement Parts
< Mechanic component >............... 121
< Main component > ...................... 123
12.3 Accessory....................................... 130
Table Of Contents

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1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download
the features of this model.
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for
example, persons other than your company’s employees, agents, subcontractors, or person
working on your company’s behalf) can result in substantial additional charges for your
telecommunications services. System users are responsible for the security of own system.
There are may be risks of toll fraud associated with your telecommunications system. System
users are responsible for programming and configuring the equipment to prevent unauthorized
use. The manufacturer does not warrant that this product is immune from the above case but will
prevent unauthorized use of common-carrier telecommunication service of facilities accessed
through or connected to it.
The manufacturer will not be responsible for any charges that result from such unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and
possibly causing harm or interruption in service to the telephone network, it should disconnect
telephone service until repair can be done. A telephone company may temporarily disconnect
service as long as repair is not done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If
these changes could reasonably be expected to affect the use of the this phone or compatibility
with the network, the telephone company is required to give advanced written notice to the user,
allowing the user to take appropriate steps to maintain telephone service.
D. Maintenance Limitations
Maintenance limitations on this model must be performed only by the manufacturer or its
authorized agent. The user may not make any changes and/or repairs expect as specifically
noted in this manual. Therefore, note that unauthorized alternations or repair may affect the
regulatory status of the system and may void any remaining warranty.
E. Notice of Radiated Emissions
This model complies with rules regarding radiation and radio frequency emission as defined by
local regulatory agencies. In accordance with these agencies, you may be required to provide
information such as the following to the end user.
1. INTRODUCTION

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F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look
slightly different.
G. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference
from unsuppressed engines or electric motors may cause problems.
H. Electrostatic Sensitive Devices
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the
sign. Following information is ESD handling:
• Service personnel should ground themselves by using a wrist strap when exchange system
boards.
• When repairs are made to a system board, they should spread the floor with anti-static mat
which is also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective
package as described.
1. INTRODUCTION

1. INTRODUCTION
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1.3 Abbreviations
For the purposes of this manual, following abbreviations apply:
APC Automatic Power Control
BB Baseband
BER Bit Error Ratio
CC-CV Constant Current – Constant Voltage
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milli watt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GSM Global System for Mobile Communications
IPUI International Portable User Identity
IF Intermediate Frequency
LCD Liquid Crystal Display
LDO Low Drop Output
LED Light Emitting Diode
OPLL Offset Phase Locked Loop
PAM Power Amplifier Module
PCB Printed Circuit Board
PGA Programmable Gain Amplifier
PLL Phase Locked Loop
PSTN Public Switched Telephone Network
RF Radio Frequency
RLR Receiving Loudness Rating
RMS Root Mean Square
RTC Real Time Clock

1. INTRODUCTION
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SAW Surface Acoustic Wave
SIM Subscriber Identity Module
SLR Sending Loudness Rating
SRAM Static Random Access Memory
PSRAM Pseudo SRAM
STMR Side Tone Masking Rating
TA Travel Adapter
TDD Time Division Duplex
TDMA Time Division Multiple Access
UART Universal Asynchronous Receiver/Transmitter
VCO Voltage Controlled Oscillator
VCTCXO Voltage Control Temperature Compensated Crystal Oscillator
WAP Wireless Application Protocol

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2. PERFORMANCE
2.1 H/W Features
Item Feature Comment
Li-ion, 1000mAh
Standard Battery Battery Size : 34.15 (W) °ø53.55(H) °ø5.7(T) [mm]
Battery Weight : 25g
Under the minimum current consumption environment
Stand by Current (such as paging period 9), the level of standby current
is below 4mA.
Talk time Up to 3 hours (GSM TX Level 5)
Stand by time Up to 200 hours (Paging Period: 9, RSSI: -85 dBm)
Charging time Approx. Under 3.75 hours
RX Sensitivity GSM, EGSM: -107dBm, DCS: -107dBm
TX output power GSM, EGSM: 33dBm(Level 5),
DCS: 30dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V Only
Display Main LCD : CSTN 128 °ø 160 pixel 65K Color
Sub LCD : STN 96 °ø 64 pixel MONO Color
Hard icons. Key Pad
Status Indicator 0 ~ 9, #, *, Up/Down Navigation Key
Menu Key, Clear Key, Send Key, END/PWR Key
Soft Key(Left/Right)
ANT Internal
EAR Phone Jack Yes (stereo)
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax Yes
Vibrator Yes
Loud Speaker Yes
Voice Recording Yes
Microphone Yes
Speaker/Receiver One way dual speaker
Travel Adapter Yes
MIDI 40 Poly
MP3/AAC Yes
Options Data Kit , CD
2. PERFORMANCE

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2. PERFORMANCE
2.2 Technical Specification
Item Description Specification
GSM
TX: 890 + n x 0.2 MHz
RX: 935 + n x 0.2 MHz (n=1~124)
EGSM
1 Frequency Band TX: 890 + (n-1024) x 0.2 MHz
RX: 935 + (n-1024) x 0.2 MHz (n=975~1024)
DCS
TX: 1710 + (n-512) x 0.2 MHz
RX: 1805 + (n-512) x 0.2 MHz (n=512~885)
2 Phase Error RMS < 5 degrees
Peak < 20 degrees
3 Frequency Error < 0.1 ppm
GSM, EGSM
Level Power Toler. Level Power Toler.
5 33 dBm ±2dB 13 17 dBm ±3dB
6 31 dBm ±3dB 14 15 dBm ±3dB
7 29 dBm ±3dB 15 13 dBm ±3dB
8 27 dBm ±3dB 16 11 dBm ±5dB
9 25 dBm ±3dB 17 9 dBm ±5dB
10 23 dBm ±3dB 18 7 dBm ±5dB
11 21 dBm ±3dB 19 5 dBm ±5dB
12 19 dBm ±3dB
4 Power Level DCS
Level Power Toler. Level Power Toler.
0 30 dBm ±2dB 8 14 dBm ±3dB
1 28 dBm ±3dB 9 12 dBm ±4dB
2 26 dBm ±3dB 10 10 dBm ±4dB
3 24 dBm ±3dB 11 8 dBm ±4dB
4 22 dBm ±3dB 12 6 dBm ±4dB
5 20 dBm ±3dB 13 4 dBm ±4dB
6 18 dBm ±3dB 14 2 dBm ±5dB
7 16 dBm ±3dB 15 0 dBm ±5dB

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Item Description Specification
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 –30
250 –33
400 –60
600~ <1,200 –60
1,200~ <1,800 –60
1,800~ <3,000 –63
3,000~ <6,000 –65
5 Output RF Spectrum 6,000 –71
(due to modulation) DCS
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 –30
250 –33
400 –60
600~ <1,200 –60
1,200~ <1,800 –60
1,800~ <3,000 –65
3,000~ <6,000 –65
6,000 –73
GSM, EGSM
Offset from Carrier (kHz). Max. dBm
400 –19
600 –21
1,200 –21
6 Output RF Spectrum 1,800 –24
(due to switching DCS
transient)
Offset from Carrier (kHz). Max. dBm
400 –22
600 –24
1,200 –24
1,800 –27
7 Spurious Emissions Conduction,Emission Status
2. PERFORMANCE

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2. PERFORMANCE
Item Description Specification
GSM, EGSM
8 Bit Error Rate BER (Class II) < 2.439% @–102 dBm
DCS
BER (Class II) < 2.439% @–100 dBm
9 RX Level Report Accuracy ±3 dB
10 SLR 8±3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 –12 –
200 0 –
300 0 –12
11 Sending Response 1,000 0 –6
2,000 4 –6
3,000 4 –6
3,400 4 –9
4,000 0 –
12 RLR 2±3 dB
Frequency (Hz) Max. (dB) Min. (dB)
100 –12 –
200 0 –
300 2 –7
500 ❈–5
13 Receiving Response 1,000 0 –5
3,000 2 –5
3,400 2 –10
4,000 2
* Mean that Adopt a straight line in between 300 Hz
and 1,000 Hz to be Max. level in the range.
14 STMR 13±5 dB
15 Stability Margin > 6 dB
dB to ARL (dB) Level Ratio (dB)
–35 17.5
–30 22.5
16 Distortion –20 30.7
–10 33.3
0 33.7
7 31.7
10 25.5
17 Side tone Distortion Three stage distortion < 10%
18 System frequency ≤2.5 ppm
(13 MHz) tolerance
19 32.768KHz tolerance ≤30 ppm